Buckshot is intended to hunt deer. Turkey shot consists of much smaller pellets, which can still do significant damage to a human, but the effective range is lesser due to the way the shot spreads out. Turkeys also see colors differently from deer, so while you can wear blaze orange and not spook the deer, you will absolutely be spotted by a turkey.

Not OP, but yeah, basically. Lots of incidents of hunters getting shot while turkey hunting.